package indi.cyken.utils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

import org.json.JSONObject;
import com.baidu.aip.util.Base64Util;


public class BdOcrUtil {

    // 官网获取的 API Key 更新为你注册的
	 public static final  String clientId = "kqhud8BHCKi5wUktyxhg02Yn";
    // 官网获取的 Secret Key 更新为你注册的
	 public static final String clientSecret = "felozkSqmzgYvjSDUwGchyCWikCNBzB6";
    
    private static String access_token;

    
    
    public static String getAuth(String ak, String sk) {
        // 获取token地址
        String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
        String getAccessTokenUrl = authHost
                // 1. grant_type为固定参数
                + "grant_type=client_credentials"
                // 2. 官网获取的 API Key
                + "&client_id=" + ak
                // 3. 官网获取的 Secret Key
                + "&client_secret=" + sk;
        try {
            URL realUrl = new URL(getAccessTokenUrl);
            // 打开和URL之间的连接
            HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.err.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String result = "";
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            /**
             * 返回结果示例
             */
            System.err.println("result:" + result);
            JSONObject jsonObject = new JSONObject(result);
            String access_token = jsonObject.getString("access_token");
            return access_token;
        } catch (Exception e) {
            System.err.printf("获取token失败！");
            e.printStackTrace(System.err);
        }
        return null;
    }
    
    
    /**
     * 单例 懒加载模式 返回实例
     * @return
     */
    public static String getInstance(){
        if (access_token==null){
            synchronized (String.class){
                if (access_token==null) {
                	access_token = getAuth(clientId,clientSecret);
                }
            }
        }
        return access_token;
    }
    
    
	public static String getOcrRessult(String filePath) throws Exception {
		if(filePath==null || filePath.equals("")) {
			return null;
		}
	     // 通用识别url
        String otherHost = "https://aip.baidubce.com/rest/2.0/ocr/v1/general";
        try {
            byte[] imgData = FileUtil.readFileByBytes(filePath);
            String imgStr = Base64Util.encode(imgData);
            String params = URLEncoder.encode("image", "UTF-8") + "=" + URLEncoder.encode(imgStr, "UTF-8");
            /**
             * 线上环境access_token有过期时间， 客户端可自行缓存，过期后重新获取。
             */

            String result = HttpUtil.post(otherHost, access_token, params);
            System.out.println(result);
            return result;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
		
	}
}
